This question has three independent parts. In each case the insulators are perfe
ID: 1287534 • Letter: T
Question
This question has three independent parts. In each case the insulators are perfect. A neutral, insulating sphere is placed in a uniform external field E0. Describe how, if at all, the chargcs on the sphere move. What is the magnitude and direction of the clcctric field at point A? An isolated, insulating sphere has a positive charge +Q uniformly distributed on its surface. At time f0the sphere is connected to ground. Describe how, if at all. the charges on the sphere move. Is the electric potential difference between point A and ground positive, negative, or zero? Explain. A neutral, conducting sphere is placed in a uniform external field E. Sketch the stable charge distribution. What is the magnitude and direction of the electric field at point A? The conducting sphere is replaced with an insulating sphere that has exactly the same charge distribution drawn above. What is the magnitude and direction of the electric field at point ,A? Explain. The direction of the external field is reversed so that it points to the left. What is the magnitude and direction of the electric field at point A? Explain.Explanation / Answer
4.
a.
(i)
Since it is insulating , it would not show any polarity due to the electric field lines
(ii)
Magnitude of current at A = 0
Direction = No direction inside the sphere
b.
(i)
Since it is insulating , it would not conduct i.e allow charges to flow from its surface to the ground
(ii)
Positive
(c).
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